Summary

• SAM/ISAM files

  It is always possible to add and select files. Any BLKCTRL values stored are used for documentation purposes only.

  The internal file format is always determined by the SAM/ISAM access method. This method also converts records to the internal block format of the file.

• UPAM files

  Neither the UPAM access method nor LMS can be used for the automatic conversion of data, since this would result in a loss of data.

  The user has ultimate control.

  File type             U P A M File located on NK disk	BLKCTRL entry generated / stored in the attribute record
  	PAMKEY	DATA	NO	—
  	1) 2)	ADD EXTRACT	ADD EXTRACT	— EXTRACT
  File located on K disk	ADD EXTRACT	ADD EXTRACT	ADD EXTRACT	— EXTRACT

  ¹) The value BLKCTRL=PAMKEY is not possible.
  ²) The selection process must be controlled by the user, e.g. by specifying a link name in the statement.